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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a183eb0b1983ddbd253b2263299a4f48853e2f40dc4cdd81a6b2bd6ab2d5cfed' 
  AND token = '+YARNz+Es0P4/ouvCjimmZtFjm1ULPMrxQUkabUJMcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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