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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91f97242bbe82a8e4ce8982bd4208832cfbb67ee82772285636614f4e2a00b7' 
  AND token = 'JUE5wJ09H2DO8qaNULOTL6xEj6Q4vqr9zEK5OVgCU8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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