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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2582d018a04f97c14a1976e51aedf4b074211d43e41bc52fc08fb366accdc15' 
  AND token = 'BjRBgLLJHs08YTqsxxlxZ4pAiNNLUowdWLjf6HkRWOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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