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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184ea33355fad58486252a16b5f3705c11508da96ffb26cca8dcc3ef7999ccd7' 
  AND token = 'rIWTfLT0hVnFcRHe5aEZ4kJQSYMlMzOvQJ9k6HLvJjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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