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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791025b35dee9cb6f71594a0216f714fedc4c90d0287e1330d3f47d7f07485eb' 
  AND token = 'cB0rCHA5K93Ffd3d77iF72Ttg54+anoaUEAliI7DmoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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