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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6679d992d2b3796d04026f0e3b4c513c32b58e2e0868afbcac6b28627854fc' 
  AND token = '/q14CkjpLDjWUY1T8kOGKId3i9rApoAwlX3wxAWoqPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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