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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e39e4f4fb3b12de8f7818b27d2148687d9c8ca2fa8cd94e34734f8bb9d5342' 
  AND token = '+Z/yJrkVPx9+qxAi5f8jw9xwoNFHDmQ4oF9nc3YaT/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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