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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd4d2192ea00c48850ef552aac4e267dcff28d4c741c7ff52c9d07ce4e6c4ef' 
  AND token = '7Z6t+tMyqPcdwhGHvzBusO3aMpFWUtbrAm654llmy68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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