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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f4b7cd9bff89927a69a0c5de0c444a3f0bbfd098cd06a20f9098bed9d5f103' 
  AND token = 'osU0gPs65XkW75dKFx+yJ/Vv7Hax1YJqI7m6ywc8RKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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