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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fc25196db1ad9ee2b2b195911b0b58b5884b90a31723bdd1ea0e202d6e0b95' 
  AND token = 'AAZmO2cDWJuizhNjFW59EF3JMB39OGplwWS2jB2DXA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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