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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bf2a35fe1e46279527b9c25604717a0225ef10fab25806357ed6c53f46c6c3' 
  AND token = '0y91Og0ZFTvf7ouM42FU9jFYwKH1tzeYdpqg0TMY6Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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