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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00426f14533ac2109b5b827ca19232a9a9d31942cd5a346a14daa8603280dd3' 
  AND token = 'NDEss5RESIsayc4qd0SLGzfXW6JZsGzXmo5IpD1+u1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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