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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007fb5acfe3fb1d7ce355ca833d201b301f8c838490c4332bf08a94883b53986' 
  AND token = 'V9NqOUKPhPQMka97nMshBSQL529a1ATB93jvi/ZE4us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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