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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5e6a5a6f2342843e2a5f3ddebf79dfaf297c75a19d14a1e461df98ad8c08e4' 
  AND token = 'EeviEHDPshnqZi4hE1espxIKak58yRN+wD//XCOZV3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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