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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53608c712cd621dae0bca12ec22201edd69f3218b329a6aad050b566c0ab41a5' 
  AND token = 'si1Aer+1SwZRFi0x7wwWfZcgwohurdG2pUkN1Tlr7/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}