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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1803f09de72019a7c14efd06d39a9b2d6b451299f96b3ef964f191a6a97c3b' 
  AND token = 'Am0BTP+mU1+lbZorcgVW6RZFH8mY+jmtbIm2AyCTmzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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