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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487b9e9d939f6b281a29ce55b90f5a742551dea6e84b6ded92ce33570b366565' 
  AND token = 'AAZF7q3wWRJUWRIF8r00Ll9gJ3V4D0ZGaF4ejT5wtDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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