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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5b3444b5c23ee047658fd9b06dbba6b4f128465b6478ddb8b38383b028c5b5' 
  AND token = 'yvd4yxMYwjiakKulIeFTR+wuOs9E55AZWcwFb/7dEuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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