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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb597794e73dac7a4f195536db974037829688a6d18637da049fa289bd9ca70f' 
  AND token = 'ikgMioY9cVUraX+14K+bm9elCwYI3rYs0QYrGfB1QQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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