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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a823d6b986fa26386d15232b20baa0063968e0ea606a2b959dafa589d52549e2' 
  AND token = 'K3PJgtx0dqH9NV1tI05CbF4tB5bZrjIjh3HyFh9evRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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