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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609607140f973c39824ac8b0debca3d62aa0b1f1781f4eb9584143ffbb7a88ed' 
  AND token = '45jQ0dbNHhbM87Joe69j5+zIdUcMTlUPK/Jt9VApV10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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