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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d70b9931ef2f2315921ac96e61816000b5af8dcbb4444d68f5fa1b0661e9b1' 
  AND token = 'LlX2A76+csUxplw0NOrxVwDfIIJSzG/oCRffppIJzIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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