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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc90143d7d137ae8f2c8b2afa19aa423ad22832e6b3d3502628ae85b2fec3c3' 
  AND token = 'nQWv2Yanw6oP4b6SMBtKm6d9zrkOYK0qHaDXpnIK0IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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