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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa9681c3f7f141cf4f49232386b988f02f5700042f6865e241d7be5e74e2b2e' 
  AND token = 'Dd2mZjOP4dc/tiUFpXma/FFOuBUNwF9dnEvTvwp2tJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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