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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce4781fb010ef99e39e82a6ab36a5e462d8998b81d2c8f01c561ec637a9e7a0' 
  AND token = 'j634UAxvyPgHQSVaRiwjdLebmehJ7Nl2jWmcuezJO8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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