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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff90137e7aa0d12a4369b944fb8596154eb2b12f3d9ee1be7db320a13856471' 
  AND token = 'Vo4LocRP7aochjy4ko6L6J7yWXAWxafGcZCLgGlTU5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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