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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb6bb840c86ed0cce8e4f6ea1efa57d387cead2a575a92b4ef139cb3ccccc19' 
  AND token = 'YzmWRtIsLpEDvo4Wnbs4+tLUGV+UXJKPQLIksR29bxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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