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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73883f19768dd94adf1154d7c69fe3cff79d934413cddcb74439d5ec7bd89d17' 
  AND token = 'd4rliAfPrrbIHxsj36TV3uokcWylJxieka2Ylf8aOrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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