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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbd26a1324c8712784b64cbd23451594e6cd70a72eff396c5e4b1a469ed2611' 
  AND token = 'wUUdrEElB69RvQAfm57a44jl3bQk5aTvXUjp2SKcZOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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