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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d7962fbe9848e2b8179fc4ec8a18f6d9e7a79c5527fd91a001180492ac8f7b' 
  AND token = 'k9l+4Tz5dMZ6Af35ecVJcdAuDFORJBjCfVrTbhTbryM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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