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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2088c010746f176ae6f166fab85fcc22d0b17d1027318de3d6ee01c3b838de3c' 
  AND token = 'H5Jeg1hv4fzJcjDvhX/VgVkD3Sfxhdh90rqj4D2WDrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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