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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2068eb1393e970fa54cd1662bd943266716c7e2d9dfd5614ddab063118105bc5' 
  AND token = 'Mxlm3/nSNZc8FlaANMUnVY3BZ2v6Sr2skmOGNqa+r4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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