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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7395c97fd6a0056bf41b48ab9d29f68982443833f6026a97eb041471c1846573' 
  AND token = 'bsteuzmJQUe4yA05LMSPp1jZn6O9P1EZLpCQouTBGzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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