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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96628b6fd4670a4f6f573e86921e6df239736c818a769dc8501341cfce22fd9' 
  AND token = 'XdYfavZLMx7MKSeh8HONEEKo6Njo4sFdGjqQ/Pw6rrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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