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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e4df2414a375de9a27e6a9e5c1d92d65ac2a5736cbdd81a0f4d17887ead749' 
  AND token = 'AgMl20HPEiRoXcLhiiG9L8sPuzieOZByTQY1y6dGoVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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