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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475af72be86b1eaebbf5a25c5c5beef0ebf3b45ef7832e149163530c7cca0451' 
  AND token = 'l7Q+Vl0+hZxq6AFfoUWkiyI+AO0+pLNGp/vnMQwuOYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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