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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9288426facf523e3a07fc263adb2877788da8ed74532207d5e82ab0bc2cd4e' 
  AND token = 'i3GSaTGs6ZOboBT5fgBERkr6cJaOC8Rr8orgmSpuAZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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