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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89fdb156dbfb9c6ece33630101e400bf4ad7daaa8ac6147a12461d69842af695' 
  AND token = 'CgaRDgKlj/PfunDvEvcqbdBhM45p+Sl0Zqu1/250Xgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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