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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5ac71feefe4ae7e601cda7a3e950c9581ca308bf5cc88251869f0511916c57' 
  AND token = 'EGom+lOFM/YYEvUfkRAnEff4QhT3vzLLtD++/FFJDvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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