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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b78eaf2454194dfb11697a87b1293552475bdb67ef6c66efce6b8c571c18583' 
  AND token = '9SUTCnmEcbqSArBECs9C2gWf0WOrdcSO3s3zSEFbzTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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