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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5369212d2a7a64b3eb8518c1d26c2461a2e14b6dc6842694d9805ef9a6619cf1' 
  AND token = 'OnJNwV/UXANP4bJ3XboqRyssftPxbheU4HUgywWfb8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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