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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b46ee2477539234018daa7a329846766391144a0e4ccf4bc7ce89da0bd7506' 
  AND token = 'EL3kfK15eFqJD4zg29A7lCdksul2HNVBCss1X9Zm+D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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