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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2fb9d3780cf55cc4c529c2eefdb4f4b542ae2756d2c1157e4bc889b9d44d3d' 
  AND token = '+IeDhwk28PUNfXGqkqB7/mTz1EGftnI4ydDEvNrQrXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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