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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e15dbd2dec87c02bd0ac7874dc75b51ba0fa57dfd3a35abeddfe4de9276dbca' 
  AND token = 'GR0gjsVCTYPHvB17vzSnrxZzbP6FNXz0u2VGaR+iucA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00139

JSON explain

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