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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a9faf35a3eba9dac8d9feb675136a14bc189d9e0931c3aca938903eaf6cf9e' 
  AND token = 'EqAH0MaxlgSo9Vq/UbGidqqYTX/2PxRQATpjeWKft1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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