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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afed8b3eb608c5329c94d153611f5e8656ef905a55b5e9a30a960aadee78efb6' 
  AND token = 'ZnnbMdqtyIqdb6To5guWOG1fo5pLYsBbwSgAN8Zmx2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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