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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ffef0d31c634a04e333ef21ef083bad96b6907c2cdb94cb2b32a6b2b8b4dbf' 
  AND token = 'F9kKEOokWGQj8BMNuljxj4+TU+cWek4fSTY3utVuMck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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