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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7592b9c3f0a97db447b4eb9e1b0788edf990ee3f013ebb2f10837cc62b81be9' 
  AND token = 'Pdz6gSpyF8GgquAbq/1PAhTf9sMc3CIgy09CKnxKXxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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