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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9875e41f4fcb71457a6fb8e242fd17fbd3e123e6b93f971708e392bdeaf0f0a' 
  AND token = '6PYZJ9BkpYxKSP8B9nfu9cPguQI7bmiKNo72E8UnflM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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