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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c936ee7436536c728501a29a59f04e1a0ae3a9e95c900eb1af2d23afbc66d8' 
  AND token = 'RMaYClJvSXOkB2HSDjD0kz6GPlp9ZJWseUoRYDtgn4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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