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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a0d9a06a5e1d965f9e104afc04301c8eb5f1692c3069ae914f679562c331d6' 
  AND token = 'qE7NRBNJQmHHOvHsAA+zU3U2WffEyDyo2GVDVNF2PE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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