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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7994cf6730667dc98abdc3f5edbb8d32e87459ca511f5e7463a6f1dc66437c3' 
  AND token = 'Uq74f656lXK2PFFNGbmgz6VlRqznsEmmOz4aHKTasWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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