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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e6351622d2da74965d7e7320dda55699578c45899240545892a5a5cce6dc70' 
  AND token = '2oh7fACP+x9x7nZ5Dx6u74RqYhaWIvzo9Ry1MW3KDUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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