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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a870662a9d15bef4efd2fbb1b559b779dcd1cdce836930bf844370281ff25d' 
  AND token = '82Ky/dTM7XXz+14971MLfDGMyvaws94ZhldC8It1zuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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