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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac94a9e2973f20c752a037e859fd0f1e8555ab6dd0cccc217ee68972080a18c' 
  AND token = 'a4g5pwdQz1t8YNlqbWmg4hlXrih79TfEJY0KMxEDyhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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