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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034a01b03e3ee2550c9db2b31028f7143992eca07a000e2e549ac6e075dd12c4' 
  AND token = '/DmVblNYdek8cEqXQSmUhl5328BXS6ZKmmH0XZBDY/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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