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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcfca82da71eafc877b86a2960554d845b584c7f6fedaa84589cf0f2aa2b95d' 
  AND token = '1w0yRIBtWdCM1OZHa7GCxjzVcVZPmiIDx/52On8UT8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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